The most likely causes of bad breath are: 1, temporary eating some odor-emitting foods such as garlic, will disappear naturally, which is the cause of temporary bad breath, we temporarily named acute halitosis, in fact, this is not even a disease, but a symptom. 2, oral problems This is easily the most common and ignored. Various gingivitis periodontal disease, not protecting the mouth, not using the correct toothbrush, and flossing, but also not regular oral check-up care, etc., may appear food residues left behind, the gap between the teeth is not cleaned and the problem around the teeth. A healthy mouth is good for the operation of the digestive system, so an important cause of bad breath is the taste from the mouth, the need for dentistry consultation, dental cleaning, and proper care to maintain a healthy mouth. 3, Chinese medicine says the stomach heat about can correspond to the Western medicine indigestion or GERD, because it is a symptom, so in many cases with stomach heat to diagnose and explain is a more accurate state. This is when bad breath is not a problem of the mouth, but an odor coming from the digestive tract in the stomach. Usually it is the irregular diet, especially eating some stimulating food, as well as seasoned, heavy food, gastrointestinal indigestion, gas reflux from the stomach contents. 4, Helicobacter pylori infection infection of the gastrointestinal tract will appear indigestion, gastrointestinal power, abnormal gas, the smell of undigested food back up appeared, this needs to be tested to determine.” For these four aspects, take the following solutions: 1, eat less food such as onion and garlic 2, clean your teeth well, then floss properly, observe for a month to determine whether there is still bad breath 3, according to Chinese medicine identification, the patient not only has stomach heat, there is also dampness trapped in the middle jiao, dampness and heat together, not easy to be cleared, so not only to clear stomach heat, but also to strengthen the spleen and chemistry so as to fundamentally solve the problem of recurrent episodes of stomach heat 4 The first thing you need to do is to get a 13C breath test to determine if you have H. pylori infection. Of course throughout, you also need a light diet, regular meals, and strengthen exercise. Although bad breath is not considered a serious illness, but small diseases, small symptoms are often a big pain for patients.